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kotlinlang

Is there an idiomatic way to write something like this?
```listOfNotNull(
    if (somethingNullable == null) {ReturnValue} else null,
    ...
)```
Currently I have an inline function:
```inline fun &lt;T, R&gt; T?.whenNull(block: () -&gt; R): R? = if (this == null) block() else null```
which I use like this:
```listOfNotNull(
    somethingNullable.whenNull {ReturnValue},
    ...
)```
Is there a better way?
Thanks in advance

```listOfNotNull(
  ReturnValue.takeIf { somethingNullable == null }
)```
?

buildList maybe? <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/build-list.html>

that would let you say `somethingNullable ?: run { add(ReturnValue) }`

In my case the ReturnValue is actually a new data class instance. Using takeIf will cause a lot of unnecessary work

I think `buildList` in combination with `?:` might do the trick. Thanks